--------No, there is no such thing as a "Wish Anime". The series is only available in its manga version, and it's highly unlikely that an animated adaption will ever be produced.
However, there *is* one little thing which proves that Kohaku, Shuichirou, Hisui, Kokyou, Kouryuu and the Cat Girls definitely would look at least as adorable in color & motion than they do in black and white stills : There is a Wish Music Video.
The only way of obtaining it is by purchasing the rather hard-to-find 'Wish Gift Box', so therefore I've decided to post it here at Clouds.Up for you to download. ^_^v